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Diet Impacts Preimplantation Histotroph Proteome In Beef Cattle

ABSTRACT: In ruminants, the period from fertilization to implantation is relatively prolonged, and survival of embryos depends on uterine secretions, or histotroph. Our objective was to determine if prebreeding diet affected histotroph proteome in beef cattle. Cows were assigned to 1 of 4 diets: control (CON), high protein (PROT), high fat (OIL), or high protein and fat (PROT+OIL). After 185d on diets, an intravaginal progesterone implant (CIDR) was inserted for 7 days. At 9 days post CIDR removal, animals with a corpus luteum were selected (n = 16, 4/treatment). Proteins were isolated from histotroph collected by uterine lavage and analyzed with LC-MS/MS. Over 2000 proteins were expressed (n >= 3 cows/treatment), with 1239 proteins common among every group. There were 20, 37, 85, and 123 proteins unique to CON, PROT+OIL, PROT, and OIL, respectively. Relative to CON, 23, 14, and 51 proteins were differentially expressed in PROT+OIL, PROT, and OIL, respectively. Functional analysis found that 53% of histotroph proteins were categorized as extracellular exosome, 3.28% as cell-cell adhesion, and 17.4% in KEGG metabolic pathways. Differences in proteomes among treatments support that prebreeding diet affects histotroph. Understanding the impact of diet on histotroph proteins may help to improve conception rates.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Bos Taurus (ncbitaxon:9913)

SUBMITTER: Kara Stewart

PROVIDER: MSV000081991 | MassIVE | Mon Jan 29 14:51:00 GMT 2018

REPOSITORIES: MassIVE

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Project description:PURPOSE: Previous mouse studies using corn oil (Ï?-6) as the dietary fat source suggest that decreasing dietary fat content can slow prostate cancer (PCa) growth. However, other studies, in which the diet was composed around saturated fat, showed no difference in outcomes between high-fat and low-fat diets. The relative effects of other fats, such as fish oil and olive oil, also remain unexplored. To our knowledge, no trial has yet compared the effect of various fats on prostate cancer progression. Therefore, we sought to systematically study the effect of fish oil, olive oil, corn oil, and saturated fat on prostate cancer progression. METHODS: A total of 96 male SCID mice were injected with LAPC-4 human PCa cells. Two weeks following injection, mice were singly-housed and randomized to either a fish oil, olive oil, corn oil, or saturated fat based diet. Animals were euthanized when tumors reached 1,000 mm3. Serum was collected at sacrifice and assayed for PSA, insulin, IGF-1, IGFBP-3, and PGE-2 levels. Tumors were also assayed for PGE-2, and COX-2 levels, and gene array analysis was performed. RESULTS: Mice weights and tumor volumes were equivalent across groups at randomization. Overall, fish-oil consumption was associated with improved survival, relative to all other dietary groups (Log-rank, all p<0.05). We did not detect any significant difference in serum PSA, insulin, IGF-1, IGFBP-3, and PGE-2 levels. Glucose at the time of sacrifice was statistically different between groups, with the fish-oil fed mice having the highest levels of serum glucose (Kruskal-Wallis, p=0.03). CONCLUSIONS: In this prostate cancer xenograft model, we found that consuming a diet in which fish-oil was the only fat source slowed tumor growth in improved survival, compared to mice consuming diets composed of olive oil, corn oil, or saturated fat sources. These results suggest that type of dietary fat consumed may be as important as amount of dietary fat consumed in the setting of prostate cancer. DESIGN: A total of 96 male SCID mice were injected with LAPC-4 human prostate cancer cells. After 2 weeks of tumor growth, the mice were randomized to one of four diets: corn oil, fish oil, olive oil, and saturated fat source diets. Animals were euthanized when tumor volumes exceeded 1000 mm^3. Sera and tissues from the median 6 surviving animals from each of the four dietary groups were analyzed.

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Diet Impacts Preimplantation Histotroph Proteome In Beef Cattle

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